Well, this one might come as a surprise to you. While going on a diet the first thing that we discard is butter. But did you know that peanut butter is very helpful in muscle building? Yes! peanut butter holds over 3 grams of protein. You can add peanut butter to your diet if you want to have an additional amount of protein in your body. Tomatoes are healthy even when they are not fresh enough. The sun-dried tomatoes have six grams of protein in it. The sun-dried tomatoes are very delicious as salad and contribute in body tissue repairment. The dried tomatoes are also used as a topping for pizza. It also contains vitamins K and A.